ios - Swift:UIDocumentInteractionController 不工作？

Question

UIDocumentInteractionController 无法处理包含多个页面的大型 pdf 文件。

在我的代码中，

      var docController:UIDocumentInteractionController!

...

    DispatchQueue.main.async (execute: { [weak self] in

            self?.docController = UIDocumentInteractionController(url: pdfFileURL!)
            self?.docController.delegate = self
            self?.docController.name = pdfFileURL?.lastPathComponent
            self?.docController.presentPreview(animated: true)
    })

和委托(delegate)方法，

func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
    return self
}

这是控制台的警告，

2017-05-26 12:46:51.178894 MyApp [3350:1136818] [default] View service did terminate with error: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted} #Remote

下面附上空白图片，

请帮帮我，谢谢。

Answer 1

像这样尝试:

声明:var interaction: UIDocumentInteractionController?

然后添加

 interaction = UIDocumentInteractionController(url: URL(string: "<PDF FILE PATH>")!)
 interaction.delegate = self
 interaction.presentPreview(animated: true) // IF SHOW DIRECT

或者如果需要任何建议弹出

interaction.presentOpenInMenu(from: /*<SOURCE BUTTON FRAME>*/, in: self.view, animated: true)

实现委托(delegate) -> UIDocumentInteractionControllerDelegate

public func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
    return self
}

public func documentInteractionControllerDidEndPreview(_ controller: UIDocumentInteractionController) {
    interaction = nil
}